“Something very, very big concerning the president of the United States,” Trump said Monday on "Fox and Friends." “It’s going to be very big. I know one thing — you will cover it in a very big fashion.”

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Trump said he would “probably” release the bombshell sometime on Wednesday.

Trump, a real estate investor and surrogate for Mitt Romney, was a registered Democrat before changing his affiliation to Republican after Obama was elected in 2009.

Since then, he’s flirted with a presidential run, while advocating conspiratorial views that fall outside the mainstream of the Republican Party.

Trump has refused to acknowledge the legitimacy of the long-form birth certificate released by the White House, and frequently takes to Twitter to question the president’s citizenship.

Trump also says he believes President Obama will start a war with Iran before Election Day to secure a second term for himself.